This is a very simple tip.  Erase all Thumbs.db files on your computer.

What is this file?

Windows creates a file called "Thumbs.db" for folders that contain pictures. The Thumbs.db file caches a thumbnail version of the pictures in the folder, making it quicker to view the thumbnail images each time the folder is opened.  It's a dynamic file, created on-the-fly, on each directy if one doesn't exist yet.  The Thumbs.db file is often viewable when the "Show Hidden Files" option is turned on in Windows. To activate this setting, first open a folder in Windows. Then choose "Folder Options" from the Tools menu.  Once you activate this setting, you will be able to search for all the Thumbs.db files on your computer and wipe them out.  I did it and saved a lot of space. Be sure to delete your recycle bin too to save space for items no longer needed.

How to Remove the Thumbs.db File forever...

You can delete the Thumbs.db file by simply dragging it to the Recycle Bin. However, the file will be regenerated each time you open the folder, which means deleting the file has little effect. To prevent the Thumbs.db file from being created, follow these instructions:

   1. Open a folder (or the specific folder you want to change).
   2. Select "Folder Options" from the View menu.
   3. Click the View tab.
   4. Check the "Do not cache thumbnails" option (see below).
   5. Click "OK" to apply the change and close the window (or click "Appy to All Folders" to make the change systemwide).